Seven South American countries have agreed on measures to protect the Amazon river basin.
The agreement will help set up a disaster response network, as well as organise satellite monitoring.
Recent forest fires have destroyed large parts of the world's largest tropical rainforest.
Representatives from Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru and Suriname gathered in Leticia, Colombia to sign the pact.
It calls for the countries involved to encourage the "international community to cooperate for the conservation and sustainable development of the Amazon region".
In a statement, Colombian President Ivan Duque said the pact will "oblige us, commit us and motivate us to protect our Amazon".
He suggested: "We believe that it is a moral duty that our societies are increasingly aware of the protection of our common home, of our mother earth, of protecting this heritage.
"[We need to understand] that harmony of sustainable development with nature should be sought."
He stressed that it's also important to work with and protect indigenous communities in the region.
On the pact itself, he added: "I believe that today we are making history."
The agreement comes after Brazil faced widespread international criticism and pressure over its handling of major forest fires last month.
Conservationists claimed that President Jair Bolsonaro's moves to weaken environmental safeguards encouraged farmers and industry to significantly increase deforestation and set fires more aggressively.
Amid the outcry, Brazil ultimately banned burning throughout the country for the dry season - with exceptions only when authorised by the country's environmental agency.